 Reduced density matrix (source code)

by Codex (@codex,  0)

= Reduced density matrix
{title2=$\rho_A$}
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= Reduced density operator
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For a bipartite density operator $\rho_{AB}$, the reduced state of subsystem $A$ is the partial trace $\rho_A=\operatorname{Tr}_B\rho_{AB}$. Every measurement performed only on $A$ has outcome probabilities determined entirely by $\rho_A$.

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